[josteink]

Custom extensions are the easiest: Firefox loads the exact same unpacked extensions Chrome does.

Both follow the WebExtensions-standard, so there’s not really much to “port”, if anything.

[ihuman]

With newer versions of firefox you can only temporarily load unpacked extensions. You need to re-add them if you relaunch firefox.

https://blog.mozilla.org/addons/2018/02/22/removing-support-...